feat(cli): Show the conversation's model in jp c show

crates/jp_cli/src/cmd/conversation/show.rs

@@ -33,13 +33,10 @@ impl Show {
             let conversation = ctx.workspace.metadata(&handle)?;
             let events = ctx.workspace.events(&handle)?;
 
+            let config = events.config().map_err(ConversationError::from)?;
+
             let mut attachments = vec![];
-            for attachment in events
-                .config()
-                .map_err(ConversationError::from)?
-                .conversation
-                .attachments
-            {
+            for attachment in &config.conversation.attachments {
                 attachments.push(attachment_detail_item(&attachment.to_url()?));
             }
 
@@ -52,6 +49,7 @@ impl Show {
                 .with_event_count(events.len())
                 .with_turn_count(events.iter_turns().len())
                 .with_title(conversation.title.as_ref())
+                .with_model(config.assistant.model.id.resolved().to_string())
                 .with_last_activated_at(Some(conversation.last_activated_at))
                 .with_pinned_flag(conversation.is_pinned())
                 .with_local_flag(local)

crates/jp_cli/src/format/conversation.rs

@@ -23,6 +23,9 @@ pub struct DetailsFmt {
     /// The conversation title.
     pub title: Option<String>,
 
+    /// The model the conversation is configured to use, as `provider/name`.
+    pub model: Option<String>,
+
     /// The number of events in the conversation.
     pub message_count: usize,
 
@@ -72,6 +75,7 @@ impl DetailsFmt {
             heading: None,
             assistant_name: None,
             title: None,
+            model: None,
             message_count: 0,
             turn_count: 0,
             pinned: None,
@@ -141,6 +145,12 @@ impl DetailsFmt {
         self
     }
 
+    #[must_use]
+    pub fn with_model(mut self, model: impl Into<String>) -> Self {
+        self.model = Some(model.into());
+        self
+    }
+
     /// Set the line rendered above the rows.
     #[must_use]
     pub fn with_heading(mut self, heading: impl Into<String>) -> Self {
@@ -206,6 +216,7 @@ impl DetailsFmt {
             "id": self.id.to_string(),
             "title": self.title,
             "assistant": self.assistant_name,
+            "model": self.model,
             "active": self.active,
             "pinned": self.pinned,
             "local": self.local,
@@ -249,6 +260,10 @@ impl DetailsFmt {
             rows.push(self.scalar("Assistant", name));
         }
 
+        if let Some(model) = self.model.clone() {
+            rows.push(self.scalar("Model", model));
+        }
+
         if self.message_count > 0 {
             rows.push(self.scalar("Events", self.message_count.to_string()));
         }
@@ -351,3 +366,7 @@ impl fmt::Display for DetailsFmt {
         write!(f, "{}", details(self.heading(), self.rows()))
     }
 }
+
+#[cfg(test)]
+#[path = "conversation_tests.rs"]
+mod tests;

crates/jp_cli/src/format/conversation_tests.rs

@@ -0,0 +1,39 @@
+use std::time::Duration;
+
+use chrono::{DateTime, Utc};
+use serde_json::json;
+
+use super::*;
+
+fn make_id(secs: u64) -> ConversationId {
+    ConversationId::try_from(DateTime::<Utc>::UNIX_EPOCH + Duration::from_secs(secs)).unwrap()
+}
+
+#[test]
+fn details_show_the_model_beneath_the_title() {
+    let details = DetailsFmt::new(make_id(1000))
+        .with_title(Some("Rework the config pipeline"))
+        .with_model("anthropic/claude-sonnet-4-5")
+        .with_pretty_printing(false);
+
+    assert_eq!(
+        details.to_string(),
+        "    ID  jp-c10000\n Title  Rework the config pipeline\n Model  \
+         anthropic/claude-sonnet-4-5"
+    );
+    assert_eq!(
+        details.json()["model"],
+        json!("anthropic/claude-sonnet-4-5")
+    );
+}
+
+/// The payload keeps every key present, so a consumer reads `model: null`
+/// rather than a missing key when no model was set.
+#[test]
+fn json_reports_a_missing_model_as_null() {
+    let details = DetailsFmt::new(make_id(1000));
+
+    let json = details.json();
+
+    assert_eq!(json.get("model"), Some(&serde_json::Value::Null));
+}